[v2] powerpc: floppy: Add missing checks after DMA map

[PATCH v2] powerpc: floppy: Add missing checks after DMA map

Posted by Thomas Fourier 7 months, 3 weeks ago

The DMA map functions can fail and should be tested for errors.

Signed-off-by: Thomas Fourier <fourier.thomas@gmail.com>
---
 arch/powerpc/include/asm/floppy.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/include/asm/floppy.h b/arch/powerpc/include/asm/floppy.h
index f8ce178b43b7..34abf8bea2cc 100644
--- a/arch/powerpc/include/asm/floppy.h
+++ b/arch/powerpc/include/asm/floppy.h
@@ -144,9 +144,12 @@ static int hard_dma_setup(char *addr, unsigned long size, int mode, int io)
 		bus_addr = 0;
 	}
 
-	if (!bus_addr)	/* need to map it */
+	if (!bus_addr) {	/* need to map it */
 		bus_addr = dma_map_single(&isa_bridge_pcidev->dev, addr, size,
 					  dir);
+		if (dma_mapping_error(&isa_bridge_pcidev->dev, bus_addr))
+			return -ENOMEM;
+	}
 
 	/* remember this one as prev */
 	prev_addr = addr;
-- 
2.43.0

Re: [PATCH v2] powerpc: floppy: Add missing checks after DMA map

Posted by Christophe Leroy 7 months, 3 weeks ago


Le 20/06/2025 à 09:55, Thomas Fourier a écrit :
> [Vous ne recevez pas souvent de courriers de fourier.thomas@gmail.com. Découvrez pourquoi ceci est important à https://aka.ms/LearnAboutSenderIdentification ]
> 
> The DMA map functions can fail and should be tested for errors.
> 
> Signed-off-by: Thomas Fourier <fourier.thomas@gmail.com>

Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>

> ---
>   arch/powerpc/include/asm/floppy.h | 5 ++++-
>   1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/powerpc/include/asm/floppy.h b/arch/powerpc/include/asm/floppy.h
> index f8ce178b43b7..34abf8bea2cc 100644
> --- a/arch/powerpc/include/asm/floppy.h
> +++ b/arch/powerpc/include/asm/floppy.h
> @@ -144,9 +144,12 @@ static int hard_dma_setup(char *addr, unsigned long size, int mode, int io)
>                  bus_addr = 0;
>          }
> 
> -       if (!bus_addr)  /* need to map it */
> +       if (!bus_addr) {        /* need to map it */
>                  bus_addr = dma_map_single(&isa_bridge_pcidev->dev, addr, size,
>                                            dir);
> +               if (dma_mapping_error(&isa_bridge_pcidev->dev, bus_addr))
> +                       return -ENOMEM;
> +       }
> 
>          /* remember this one as prev */
>          prev_addr = addr;
> --
> 2.43.0
>

Re: [PATCH v2] powerpc: floppy: Add missing checks after DMA map

Posted by LEROY Christophe 7 months, 3 weeks ago


Le 20/06/2025 à 09:55, Thomas Fourier a écrit :
> [Vous ne recevez pas souvent de courriers de fourier.thomas@gmail.com. Découvrez pourquoi ceci est important à https://aka.ms/LearnAboutSenderIdentification ]
> 
> The DMA map functions can fail and should be tested for errors.
> 
> Signed-off-by: Thomas Fourier <fourier.thomas@gmail.com>

Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>

> ---
>   arch/powerpc/include/asm/floppy.h | 5 ++++-
>   1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/powerpc/include/asm/floppy.h b/arch/powerpc/include/asm/floppy.h
> index f8ce178b43b7..34abf8bea2cc 100644
> --- a/arch/powerpc/include/asm/floppy.h
> +++ b/arch/powerpc/include/asm/floppy.h
> @@ -144,9 +144,12 @@ static int hard_dma_setup(char *addr, unsigned long size, int mode, int io)
>                  bus_addr = 0;
>          }
> 
> -       if (!bus_addr)  /* need to map it */
> +       if (!bus_addr) {        /* need to map it */
>                  bus_addr = dma_map_single(&isa_bridge_pcidev->dev, addr, size,
>                                            dir);
> +               if (dma_mapping_error(&isa_bridge_pcidev->dev, bus_addr))
> +                       return -ENOMEM;
> +       }
> 
>          /* remember this one as prev */
>          prev_addr = addr;
> --
> 2.43.0
>